Extreme low air pressure deadweight tester

Details Extreme low air pressure deadweight tester Extreme low air pressure deadweight tester

2006-12-12

2006-12-12

Williams, Hezron (Department: 2856)

Measuring and testing

Instrument proving or calibrating

Fluid pressure

C073S001680, C073S001630

Reexamination Certificate

active

07146843

ABSTRACT:
The present invention relates to Deadweight Pressure Testers used for the calibration of air pressure transducers. An air pressure transducer, which is to be calibrated, is set in parallel with the deadweight tester. Air is slowly pumped into the cylinder and the pressure inlet of the said pressure transducer to be calibrated. The air, which enters the cylinder under pressure, exerts a force on the cylindrical piston, thereby lifting the piston and balancing it against the air pressure. This force is balanced by the weights loaded on the top of the cylindrical piston. When the air pressure and the weights balance, the air pressure is known from the weights and the diameter of the cylindrical piston. A thin rubber seal allows for low friction and low air loss providing greater accuracy in measurements.

REFERENCES:
patent: 4798094 (1989-01-01), Newhall et al.
patent: 4815313 (1989-03-01), Beard
patent: 5025654 (1991-06-01), Haefner
patent: 5259235 (1993-11-01), Kolb
patent: 6848292 (2005-02-01), Joseph et al.

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